Virus-like program that spreads automatically to other computers by sending itself out by email or by any other means. A program that propagates itself by attacking other machines and copying itself to the affected machine.
Worms have self-replicating code that travels from machine to machine by various means. A worms first objective is merely propagation. Worms can be destructive depending on what payload they have been given. Worms may replace files, but do not insert themselves into files.
Comment:
This infection sends notes to Facebook friends of people with infected computers, with subjects like:
"You look just awesome in this new movie."
Users are directed to a website, where they are told to download what is claimed to be an update of the Adobe Flash player.